Installation
2
0
1
8
-0
3
13
Note!
RS-485 bus termination
If the interface module is operated as the first or last physical device in an RS-485 bus, there
must be a bus termination on this module. To do this, set the slide switch "Rx 422 Termination"
to "Off" and the slide switch "Tx 422 Termination" to "On". This activates the RS-485 terminator
(150
Ω
) built into the interface module.
If you only connect one WCS reader to the interface module, you must always activate the RS-
485 terminator, see also Cable routing in the RS-485 bus.
*) RS485-
T
er
mina
tion:
Rx422 = off
T
x422 =
on
1
2
3
4
5
6
7
Rx
232
T
x
232
AP
-GND
Rx
422+
Rx
422-
T
x
422+
T
x
422-
RS485+
RS485-
Rx422*
Ter
mination
Tx42
2*
On
O
ff
On
O
ff
X1